Download a file using smartclient

[lchen]

Hi,
I have a scenario where i have to download a file which gets generated when the user send the request to download. so everytime user ask for download i have to pass certain parameters as well along with the request.

I have created a DMI having a downloadFile method, a DS having a field of type binary, an object having a getter setter method of property of type Inputstream defined in DS. so what i did was onclick of a button i call a js function below, passed some parameters and call the DMI.downloadFile function:

function openHelpContent(){

var data = {};
data.param1 = "123";
data.param2 = "param2";

isc.DataSource.get("downloadDS").downloadFile({data: data});
}


DMI class below:

public class DownloadDMI {
public DSResponse downloadFile(DSRequest dsRequest) throws Exception {

long t1 = System.currentTimeMillis();
DSResponse dsResponse = new DSResponse();

DownloadItem file= new DownloadItem();
InputStream stream = new FileInputStream( "C:/Eval_Users_Guide.pdf" );
file.setFile(stream);
dsResponse.setData(file);
return dsResponse;
}
}


DS code below:
<DataSource ID="downloadDS" serverType="generic">
<fields>
<field name="file" type="binary"/>
</fields>
<serverObject lookupStyle="new" className="com.ftid.evs.corp.webapp.smartclient.dmi.DownloadDMI" />
</DataSource>


Object code below:
public class DownloadItem {
private InputStream file;

public InputStream getFile() {
return file;
}

public void setFile(InputStream file) {
this.file = file;
}
}

But i am getting the exception:
java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Map
at com.isomorphic.rpc.RPCManager.completeResponse(RPCManager.java:662)
at com.isomorphic.rpc.RPCManager.send(RPCManager.java:499)
at com.isomorphic.rpc.RPCManager.sendFailure(RPCManager.java:582)
at com.isomorphic.rpc.RPCManager.sendFailure(RPCManager.java:603)
at com.isomorphic.servlet.IDACall.processRequest(IDACall.java:112)
at com.isomorphic.servlet.IDACall.doPost(IDACall.java:54)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at com.isomorphic.servlet.BaseServlet.service(BaseServlet.java:152)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.isomorphic.servlet.CompressionFilter.doFilter(CompressionFilter.java:248)



Please let me know what wrong i am doing?

[Isomorphic]

Call the server-side API RPCManager.doCustomResponse() to indicate to SmartClient that this is a file download operation.

[RHill]

I donīt know where to put the RPCManager.doCustomResponse(), because the compiler says:

Cannot make a static reference to the non-static method doCustomResponse() from the type RPCManager.

My JSP code is:

		
			<isomorphic:loadDS ID="downloadFile"/>
		
			function openHelpContent(){
			
				var data = {};
				data.param1 = "123";
				data.param2 = "param2";
						
				isc.DataSource.get("downloadFile").downloadFile({data: data}); 

			}		
		
		
			Button.create({
			    title: "Download File",
			    position: "relative",
			    width: 150,
			    click: function () {
					openHelpContent();							        
			    }
			});

Please help me to make this code to run.

Thanks

[Isomorphic]

In your DMI implementation, add an argument of type RPCManager as the second argument to downloadFile. It will be provided automatically. Call doCustomResponse() on this object.